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Demographic characteristics of study subjects
| Variables | Study subjects (n = 278) |
| Age, mean ± SD | 58.0 ± 9.9 |
| Gender (%) | |
| Female | 52.9 |
| Male | 47.1 |
| Race (%) | |
| Non-Hispanic white | 74.5 |
| Hispanic | 19.1 |
| Others | 6.5 |
| Smoking history | |
| Current (%) | 46 |
| Pack-years, mean ± SD | 40.9 ± 25.5 |
| Duration, mean ± SD | 32.7 ± 10.6 |
| Cryopreservation duration (days, mean ± SD) | 368 ± 190 |
| Seeding count (×106 per culture, mean ± SD) | 1.7 ± 0.6 |
| Mutagen sensitivity (breaks per cell, mean ± SD) | 0.28 ± 0.16 |
